# 构建阶段
FROM maven:3.6.3 AS builder

WORKDIR /app

# 复制 Maven 配置文件
COPY pom.xml .

# 下载依赖（利用 Docker 缓存层）
RUN mvn dependency:go-offline -B

# 复制源代码并构建
COPY src ./src
RUN mvn clean package -DskipTests -B

# 运行阶段
FROM eclipse-temurin:21-jre-alpine

WORKDIR /app

# 从构建阶段复制 jar 包
COPY --from=builder /app/target/*.jar app.jar

# 设置文件所有权
RUN chown -R appuser:appgroup /app

# 切换到非 root 用户
USER appuser